Dictionary and Thesaurus

Definition of Serious

• (a.) Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile.
• (a.) Really intending what is said; being in earnest; not jesting or deceiving.
• (a.) Important; weighty; not trifling; grave.
• (a.) Hence, giving rise to apprehension; attended with danger; as, a serious injury.

Synonyms of Serious

• Dangerous
• Grave
• Grievous
• Severe
• Life-Threatening
• Good
• Unplayful
• Sober

Antonyms of Serious

• Frivolous
• Playful

Homophones of Serious

• Cereus